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Read the installation instructions in the box. You need to go to your auto parts store and buy high temp gasket to put around your stock metal gaskets just to ensure a good seal. I used copper paste which was like 7 bucks at advance. Using the copper gasket maker also allows you to apply some to the metal gasket to make it stick to the head or the header when installing the new headers so that it doesnt keep sliding out and falling down.
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